FR565731A - Appareil perfectionné pour produire un enregistrement photographique de variations de lumière effectuées par des variations de son
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Appareil perfectionné pour produire un enregistrement photographique de variations de lumière effectuées par des variations de son
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G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR565731D1923-05-021923-05-02Appareil perfectionné pour produire un enregistrement photographique de variations de lumière effectuées par des variations de son
ExpiredFR565731A
(fr)